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Amphiphilic Molecules, Interfaces and Colloids: 2nd Edition
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Amphiphilic Molecules, Interfaces and Colloids: 2nd Edition

A special issue of Molecules (ISSN 1420-3049). This special issue belongs to the section "Physical Chemistry".

Deadline for manuscript submissions: 31 August 2025 | Viewed by 2002

Special Issue Editors

Dr. Plamen Tchoukov

E-Mail Website
Guest Editor
Institute of Physical Chemistry, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
Interests: emulsion and foams; thin liquid films; interfacial and bulk rheology; heavy crude oil; petroleum emulsions; electrochemical impedance spectroscopy of thin film; self-assembly
Special Issues, Collections and Topics in MDPI journals
Dr. Khristo Khristov

E-Mail Website
Guest Editor
Institute of Physical Chemistry, Bulgarian Academy of Science, 1113 Sofia, Bulgaria
Interests: emulsion and foams; thin liquid films; interfacial and bulk rheology; heavy crude oil; petroleum emulsions; electrochemical impedance spectroscopy of thin film; self-assembly
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Colloids, such as emulsions, foams, sols, and gels, play an integral role in living organisms, the natural environment, resource extraction, pharmaceuticals, cleaning products, processing industries, and almost all aspects of our everyday life. To a large extent, colloid stability and functionality are defined by the properties of interfaces between dispersed and continuous phases and by the surface forces acting at the micro- and nanoscale levels. It is the amphiphilic molecules that are capable of altering colloidal system properties, thus changing overall system behavior. This is why a comprehensive understanding of amphiphile molecular structure and the respective interactions taking place at the interfaces ensures effective control over colloidal system properties. For this Special Issue, we welcome contributions that highlight the relation between amphiphile molecular structure, self-assembly in solutions, molecular arrangements at interfaces, specific interactions at the micro- and nanoscale, and the properties displayed by colloidal systems. Suitable research will span from fundamental studies on the physicochemical behavior of colloidal systems to the design of innovative solutions for practical applications.

Dr. Plamen Tchoukov
Dr. Khristo Khristov
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Molecules is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2700 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • emulsions
  • foams
  • sols
  • gels
  • amphiphilic molecules
  • self-assembled structures
  • phase behavior
  • surface forces
  • intermolecular forces
  • adsorption
  • rheology
  • design of functionalized colloids
  • thin liquid films

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Related Special Issue

Published Papers (3 papers)

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Research

18 pages, 2645 KiB  
Article
Charge Regulation in Liquid Films Stabilized by Ionic Surfactants: Change in Adsorption with Film Thickness and Phase Transitions
by Iglika M. Dimitrova and Radomir I. Slavchov
Molecules 2025, 30(3), 659; https://doi.org/10.3390/molecules30030659 (registering DOI) - 1 Feb 2025
Viewed by 423
Abstract
When a liquid film is thinning, the charge and the potential of its surfaces change simultaneously due to the interaction between the two surfaces. This phenomenon is an example for charge regulation and has been known for half a century for systems featuring [...] Read more.
When a liquid film is thinning, the charge and the potential of its surfaces change simultaneously due to the interaction between the two surfaces. This phenomenon is an example for charge regulation and has been known for half a century for systems featuring aqueous solutions in contact with metals, salts, biological surfaces covered by protolytes, etc. Few studies, however, investigated regulation in foam and emulsion films, where the charge is carried by soluble ionic surfactants. This work presents an analysis of the phenomenon for surfactants that follow the classical Davies adsorption isotherm. The electrostatic disjoining pressure Πel was analyzed, and the Davies isotherm was shown to lead to Πel ∝ h−1/2 behavior at a small film thickness h. As usual, the charge regulation regime (constant chemical potential of the surfactant) corresponded to a dependence of Πel on h between those for constant charge and constant electric potential regimes. The role of the background electrolyte was also studied. At the water–air interface, many ionic surfactants exhibit a surface phase transition. We show that the interaction between the two surfaces of a foam film can trigger the phase transition (i.e., the film changes its charge abruptly), and two films of different h values can coexist in equilibrium with each other – one covered by surfactant in the 2D gaseous state and another in the 2D liquid state. Full article
(This article belongs to the Special Issue Amphiphilic Molecules, Interfaces and Colloids: 2nd Edition)
18 pages, 2662 KiB  
Article
Insight into Oil-in-Water Emulsions Stabilized by Cross-Linked and Pregelatinized Starches: The Effect of Molecular Structure, Surface Activity and Proton Molecular Dynamics
by Joanna Le Thanh-Blicharz, Jacek Lewandowicz, Artur Szwengiel, Krystyna Prochaska, Hanna Maria Baranowska and Grażyna Lewandowicz
Molecules 2024, 29(23), 5626; https://doi.org/10.3390/molecules29235626 - 28 Nov 2024
Viewed by 659
Abstract
Effective formation and stabilisation of emulsions while meeting high consumer requirements, including the so-called green label, is still a technological challenge. This is related to the multitude of emulsion destabilization mechanisms and the vastness of methods used to study them, which implies the [...] Read more.
Effective formation and stabilisation of emulsions while meeting high consumer requirements, including the so-called green label, is still a technological challenge. This is related to the multitude of emulsion destabilization mechanisms and the vastness of methods used to study them, which implies the need to develop an understanding of the phenomena occurring in emulsions. Commercial starch preparations obtained by physical and chemical modification were used to prepare model emulsions that were studied in terms of their stability. Native potato starch was the reference material. The analytical methods used included rheology, low field nuclear magnetic resonance (LF NMR), size exclusion chromatography with triple detection (SEC), and surface/interfacial tension measurements. The results showed that chemical and physical modification improved the functionality of starch in emulsions. This is due to not only chemical but also physical modifications, i.e., pregelatinization causes changes in the molecular structure of starch, including an increase in the molecular weight and the degree of branching. As a consequence, the conformation of starch macromolecules changes, which results in a change of the dynamics of protons in the continuous phase of the emulsion and the thermodynamics of starch adsorption at the water/oil interface. Full article
(This article belongs to the Special Issue Amphiphilic Molecules, Interfaces and Colloids: 2nd Edition)
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11 pages, 4269 KiB  
Article
Exploring the Optical Properties of Carotenoid-Based Nanoparticles: The Role of Terminal Groups
by Ryuju Suzuki, Keigo Kinoshita, Takeshi Miuchi, Masayuki Nishino, Yasuhiro Shimizu and Shigeru Deguchi
Molecules 2024, 29(22), 5456; https://doi.org/10.3390/molecules29225456 - 19 Nov 2024
Cited by 1 | Viewed by 722
Abstract
Carotenoids are increasingly used as naturally occurring food colorants. For application as beverage colorants, fat-soluble carotenoids are formulated into dispersion systems via nanoparticle (NP) formation. In recent years, the antioxidant properties of carotenoids have gained immense recognition for their preventive health benefits, thereby [...] Read more.
Carotenoids are increasingly used as naturally occurring food colorants. For application as beverage colorants, fat-soluble carotenoids are formulated into dispersion systems via nanoparticle (NP) formation. In recent years, the antioxidant properties of carotenoids have gained immense recognition for their preventive health benefits, thereby highlighting further interest in their development as functional food ingredients. Although functional carotenoids in dispersion-based formulations are desirable, knowledge regarding the structural and optical properties of NPs of carotenoids other than those of β-carotene, and methods to efficiently produce and compare NPs of various carotenoids, remain scarce. In this study, NPs of β-carotene, lycopene, astaxanthin, and lutein were prepared using a simple reprecipitation method, with a focus on understanding the variations in the molecular self-assembly influenced by the quality of solvent used during reprecipitation. This study presents the novel finding that the terminal groups of carotenoids significantly affect the intermolecular interactions, thereby altering the structural and optical properties of the resulting NPs. Our findings are expected to contribute to the development of new technologies for controlling the color of carotenoids based on the crystal structure of the NPs. Full article
(This article belongs to the Special Issue Amphiphilic Molecules, Interfaces and Colloids: 2nd Edition)
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